I assume what he's attempting to say is that both x and n contain the function which returns y. However, x.toString() appears to show 5 to me, which I'd expect.

If x were a reference to n then that'd be expected behaviour, but it isn't, and so I don't understand why he's telling us that.

Perhaps somebody else has a better idea.

__________________
The man who comes back through the Door in the Wall will never be quite the same as the man who went out.